Android─取得系統時間 和比較時間

Calendar c = Calendar.getInstance(); 

取得系統日期：year = c.get(Calendar.YEAR);

              month = c.grt(Calendar.MONTH);

              day = c.get(Calendar.DAY_OF_MONTH);

取得系統時間：hour = c.get(Calendar.HOUR_OF_DAY); 

              minute = c.get(Calendar.MINUTE);

如何比較時間

Calendar c = Calendar.getInstance();
    c.set(Calendar.MONTH, Calendar.MARCH);
    c.set(Calendar.DAY_OF_MONTH, 3);
 long time2=   c.getTimeInMillis();
 c.set(Calendar.MONTH, Calendar.AUGUST);
 c.set(Calendar.DAY_OF_MONTH, 8);   
 long time3=   c.getTimeInMillis();
 if(time>time2){
     //Logic
     if(time>time3){
         //Logic
     }
 }

參考網址:
http://goo.gl/YSnst
http://goo.gl/8WXJXt